Disabling some installs

First, thanks for this tool! I really love the concept, and I think this will be a big leap forward on how our imaging will work moving forward. I had one discovery, and one question. The discovery was minor, but I thought I would pass it on. I created a base image, and an edited bash file for the install. Trying to install a 10.5 image from a machine booted from 10.4 does NOT work. While booted off of 10.4, it does not like the main OSInstall.mpkg file for 10.5. Just wanted to pass this along to save time if someone was trying. Now for the question. Running this script 'out of the box' installs everything on the installer DVD. All the languages, print drivers, etc. Is there any way to trim this down? Is it just a matter of opening the OSInstall.mpkg, and deleting packages that install the languages? Can I just find 'japanese.pkg' and delete it? Thanks for the product, and the help!